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"disc"
position for "dbx
encoded
disc,'
play
This unit
comes
with
a
"disc"
position
on
the Noise Reduction
Selector
Switch for
playing "dbx
encoded
discs"
*.
When this selector switch is set to the
position given in
the
figure below, "dbx
encoded
discs"
can
be
played
Noi
se
Dolby NR
Follow the procedure given below
(1)
Set
the
recording output selector swilch on the
stereo
amplif
ier to
the
"phono"
position and
set
the input selector
switch
or tape monitoring switch
to
the
"tape"
position.
(2)
Set
this
unit's
input selector
to
the
"line"
position
and set
the Noise Beduction Selector Switch
to
the
"disc"
position.
(3)
Start operating
the
turntable.
(4)
Adjust the
unit's
lnput
Level
Controls
so
that the
Fluores-
cent
Meter Scales
def
lect
to near ,,0
dB".
(5)
Adjust the volume using the volume control
on the stereo
amplifier.
Now set the mechanism
to
the stop mode.
Some
open-reel type dbx
encoded tapes
are
now
available
f
rom music
stores
These tapes can
be
played
back
just
like
the
records
by
setting the Noise
Reduction
Selector
Switch to the
"disc"
position
Notes:
olf
the
Noise
Reduction Selector Switch
is
set
to
the
"disc"
position during ordinary tape
playback,
the
playback
sound
will
not
be
audible
olf
the mechanism
is
operated
during
"disc"
play,
it
will
work
but the tape playback sound will not
be
audible.
lf
the
Record Button
is
depressed
and
the
deck set to
the
recording mode,
the
decoded sound
(the
now
restored
original
sound)will
be
recorded
When playing
back
this
sound,
set the
Noise
Reduction
Selector
Switch
to
the
"out"
position
.lf
the
Record
Button
is
depressed when
you
are
listening to records
with
the
Noise Reduction Selector
switch at the
"disc"
position, the
sound
will
be cut
off
for an
instant
This
is
not
a
malfunction
aTo record
"dbx
encoded
records"
using the dbx Noise
Reduction System,
first set the
Noise
Reduction
Selector Switch
to
the "out"
position
and
start
recording This
makes
it
possible
to
record
in
the
encoded state.
For playback, set the selector switch to
the
"tape"
position. The recording
level should
be
set
as
follows
First set the
Noise Beduction Selector Switch
to
the
"disc"
position and adjust the lnput
Level Controls to
around
"-3dB"
so that
the Fluorescent
Meter Scales
meter
pointers
do
not exceed
"0dB',
at
peak
times.
Now
set the
Noise Reduction Selector Switch
to
the
"out"
position
again and proceed with the recording.
Sounds
monitored
while
recording
"dbx
encoded
records" are
encoded
(compressed) sounds,
not
decoded
sound
*
''dbx
encoded discs
(records)"
dif
f
er
f
rom
ordinary
records
in
that
dbx
noise reduction encoding
(compression)
is
per-
formed when the signals are cut into the
records
During play,
these signals
pass
through
a
decoder and the
original
sound
is
restored. This
makes
for a virtually
noise-free sound,
a
wide
dynamic
range
and better
music
reproduction
"Metal tape"
magnetic
,,Metal
tape,,
f
requency response
characteristics
example
oda:
r6onwh/m
"Meta!tape"
Advantages and magnetic characteristics of
,,Metal
tape"
1
.
Maximum
output
level (MOL)
is
greater
at all
frequencies.
2.
Excellent frequency response characteristics at
high input
level.
3
Wide
dynamic
range
at
high
frequencies.
4.
Excellent signal-to-noise
ratio
at
high frequencies.
5
Low
distortion
Technological developments to
accommodate
"Metal tape"
"Metal
tape"
is a
totally
new kind
of
high performance
tape,
and
conventional cassette
tape decks cannot
sufficienily
bring
out
its
performance potential.
Our
company
has
succeeded
in
developing
the
foilowing
technology
to
exploit the
advantages
of
"Metal tape',
to
its
fullest extent.
1.
Development
of the SX
head featuring
minimal
distortion
with high input signal
levels.
The SX
head employs
permalloy
and
it
features
a
high
saturation
magnetic
f
lux
density and
also
a
superlative wear
resistance.
lt
was developed especially
for
the
new
breed of
"Metal
tape".
2.
Development of
high-ef
f
iciency
sendust erase
head.
Sendust is a material with a high saturation
magnetic flux
density
and it
is
capable
of
extremely
eff
icient erasing even
with
"Metal
tape" with
a
high maximum output level
3. The power
in the
bias oscillator circuit has
been
increased.
A
word about "Metal tape"
Conventional cassette tapes can be broadly classified into
2
categories according
to the
magnetic material coated on
the
tape
surface:
the
ferric-oxide
(
7
-FezOs)
type,
including
ordinary
LH
tape, etc.;
and the chrome-dioxide
(CrOz) type,
including
XA tape, etc.
Continued technological advances have been made
in
an
attempt
to
develop these
tapes to a high level of performance,
but
recently there
has
been
a
recognized
need
for
the
development
of
a
new
material to
improve
performance
much
further
ln
response
to
this need,
',Metal
tape,'has
been developed
as
a
new kind
of
tape, employing
a
magnetic alloy
of
pure
iron
(Fe)
as the
main
component
in the
magnetic substance.
ln
comparison
with
conventional cassette
tape, ,,Metal
tape,,can
record
a
far
greater
amount
of
information
at
a
high
density.
As
a result, the
maximum
output level
(MOL) has been improved
throughout the entire range, and, in particular,
the frequency
response characteristics
at high levels and the dynamic range
in the
high
range have been
greatly
improved. This
means,
therefore, that
a
remarkable
improvement
of
sound
quality
has
been made
possible
(lt should
be
noted that the tape
base
and
parts
of
the tape other than the
magnetic substance are
com_
posed
of
the same
material
as
previously
used.)
-4-
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